Improved steam-engine



A. HARTUPEE.

' aveva-w1 l l J I L-Il WW'ZMJASS naar sara ANDREW HARTUPEE, OFPI'ITSBURG, PENNSYLVANIA.

Letters Patent No. 93,199, 1a-ted August 3, 1869,

nvrrmovnn STEAM-ENGINE.

The Schedule referred to in these Letters Patent and making part bf thesame.

...Ops-

To all whom 'it ma/y concern:

Be it known that I, ANDREW HARTUPEE, of the city of Pittsburg, in the county of Allegheny, and State of Pennsylvania, have invented a new and useful Improvement in Steam-Engines; and I do hereby deelare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing, making a part of this specification, in which- Figure l is atop or plan view, showing a double cylinder, andthe bottom of the stearn-chest, and

Figure 2 is a longitudinal vertical section thereof, and also of the valves and steanr-chest complete.

Like letters of reference indicate like parts `in each.

Myv invention relates to that class of steam-engines in which the steam is used expansively, first in oneA cylinder', whence, after each stroke 'of the piston, and before the steam has expanded to anything like its full capacity, it is exhausted, through a steam-chest, into another' andY larger cylinder, where it'acts on a larger piston. y

In order to prevent loss by condensation, and to secure a simultaneous stroke in the same direction to bot-h pistons, I have arranged the two cylinder's together, end to end,- under a single steam-chest, operate both valves therein bya single valve-stem, exhaust from the irstor' smaller' cylinder ntothe steam-chest, and thence pass the steam through suitable ports into the larger cylinder'.

Then, in order that both pistons maybe operated simultaneously, and in the same direction, I have delvised, in connection with such double cylinders, double valves and valve-chest, cross-ports, as hereinafter described, by means of which I am enabled to accomplishtheresnlts stated with the greatest utilization of power and rnirrirnum of loss,- and therein consists the nature of my invention.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and mode of operation.

a and b 1'eprese`nt`tw0 steam-cylinders, of the ordinary or any known construction, the first one, a, being much less in diameter than the seeond'one, b, the ratio being, preferably, as l to 5. Both have the same length of stroke.

1n these cylinders the pistons a' and b operate, in the usual way, and communicate mot-ion through the stems c c connected therewith.

d is a steam-chest, covering the ports and valves of both cylinders.- y

e and e' are slide-valves, of the usual' or other knownv construction.

A single stem, f, operates both valves.

Through the port g, steam is admitted from the steamgenerator or boiler. g

The por'ts h h' lead from either side of this port g to the opposite ends of the cylinder a, but in doing so they cross each other, as shown in g. 2.

Then, with the throw of the valve e in either' direction, both of the ports h h ar e opened, by which steam passes'from the port g to the cylinder a, and by the other of which the steam is exhausted from the cylinder a into the steam-chest d, and so on continuously andalternately.

The other valve, c', operates in the usual way,alter uately uncovering the steam-ports t fi', to receive and pass into the cylinder lrthe steam in the steam-chest d, (it havingr been previously used in the cylinder a, and also alternatelyl bring each port it' into communication with the exhaust-port n.

The valve e is a little narrower than the steamchest, so that steam exhausted from the port h may pass around it, to enter the other cylinder. It will now be perceived that the two pistons, c' b', operate together' in the same direction, and with the same length of stroke; that the valves e e likewise have a common direction and length of throw that the first cylinder a takes stcarn through its opposite ports, from a common steam-port, g, uses the steam expausively `up to a certain point of its expandingpower; that the steam is then exhausted into the steam-chest d, and passed into the other' and larger cylinder' lg, where it continues to act expansively on the piston b.

MIo attain these results, I make the ports h h' cross each other', each one leading to the opposite end of the cylinder' a. Thus, that is, by cross-ports, and while having but a single steam-port, g, and a single exhaustport, n, I attain the desired'results.

The devices described are free cheaply constructed, and durable. v

What I claim as my invention, and desire to secure by Letters Patent, is

from complexity,

In a double-cylinder steam-engine, the cross-ports 7i h', in combination with the-valves e e and steamchest (l, constructed substantially as her'einbefore set forth.

I testimony whereof, I, the said ANDREW HARTU- 1'nE,-h-ave hereunto set my hand.

ANDREW HARTUPEE.

IVitnesses:

A. S. Nrcnorrsorr, y R. G. WRENSHALL. 

